Shingles
Shingles is a painful rash illness caused when varicella-zoster virus, the virus behind chickenpox, reactivates later in life or during weakened immunity.
What shingles is
Shingles, also called herpes zoster, is a reactivation of varicella-zoster virus. The first infection with this virus causes chickenpox. After that illness, the virus can stay inactive in nerve tissue for years and later reactivate as a localized, often painful rash.
Why the rash follows nerves
When varicella-zoster virus reactivates, it travels along nerve pathways toward the skin. That is why shingles often appears in a band or patch on one side of the body rather than as a whole-body rash. Pain, tingling, burning, or itching may start before blisters are visible.
Symptoms
The rash usually develops into clusters of fluid-filled blisters that scab over as they heal. Some people also have fever, chills, headache, or upset stomach. Shingles near the eye is especially urgent because it can threaten vision, and a clinician should evaluate it quickly.
Risk factors
Anyone who has had chickenpox can develop shingles, but the risk rises with age. People with weakened immune systems, certain cancers, HIV infection, organ transplants, or immune-suppressing medicines are also at higher risk. Children can get shingles, but it is much less common.
Complications
The most common long-term complication is postherpetic neuralgia, nerve pain that continues after the rash heals. Other possible complications include bacterial infection of the rash, eye involvement, neurologic problems, and widespread disease in people with severely weakened immune systems.
Treatment
Antiviral medicines such as acyclovir, valacyclovir, or famciclovir can shorten the illness and reduce severity, especially when started soon after the rash appears. Pain control and skin care also matter. People who suspect shingles should contact a healthcare professional promptly rather than waiting for the rash to spread.
Vaccination
Shingles vaccination lowers the risk of shingles and related complications. CDC recommends two doses of recombinant zoster vaccine for adults 50 years and older, and for adults 19 years and older who have weakened immune systems because of disease or therapy. Local recommendations can differ by country and health history.
Can shingles spread
A person does not catch shingles from someone else in the usual sense. However, someone with shingles can spread varicella-zoster virus to a person who is not immune, and that person may develop chickenpox. Covering the rash, avoiding scratching, and limiting contact with high-risk people reduce spread while blisters are active.
Why it matters
Shingles matters because it links a common childhood infection to later nerve pain, vision risk, and vaccine decisions in adulthood. Knowing the early signs helps people seek treatment quickly, while vaccination turns a hidden viral reactivation into a preventable public-health target.